LinuxKPI: 802.11: WEP noise
While we decided that we will not provide WEP support for the LinuxKPI
802.11 compat code, some of it is in there already (also because drivers
still support it). Put proper keylen checks in place as net80211 only
knows about WEP while LinuxKPI has WEP40 and WEP104.
Sponsored by: The FreeBSD Foundation
(cherry picked from commit aaee0ed3d163a1d29ea74d7e4d2c3658a51cfb27)